Java StandardJavaFileManager类代码示例

import javax.tools.StandardJavaFileManager; //导入依赖的package包/类
/**
 * Verify bad file object is handled correctly.
 */
@Test
public void testBadFileObject() throws Exception {
    File testSrc = new File(System.getProperty("test.src"));
    File srcFile = new File(testSrc, "pkg/C.class");  // unacceptable file kind
    DocumentationTool tool = ToolProvider.getSystemDocumentationTool();
    try (StandardJavaFileManager fm = tool.getStandardFileManager(null, null, null)) {
        File outDir = getOutDir();
        fm.setLocation(DocumentationTool.Location.DOCUMENTATION_OUTPUT, Arrays.asList(outDir));
        Iterable<? extends JavaFileObject> files = fm.getJavaFileObjects(srcFile);
        try {
            DocumentationTask t = tool.getTask(null, fm, null, null, null, files);
            error("getTask succeeded, no exception thrown");
        } catch (IllegalArgumentException e) {
            System.err.println("exception caught as expected: " + e);
        }
    }
}
 

import javax.tools.StandardJavaFileManager; //导入依赖的package包/类
/**
 * Verify null is handled correctly.
 */
@Test
public void testNull() throws Exception {
    DocumentationTool tool = ToolProvider.getSystemDocumentationTool();
    try (StandardJavaFileManager fm = tool.getStandardFileManager(null, null, null)) {
        File outDir = getOutDir();
        fm.setLocation(DocumentationTool.Location.DOCUMENTATION_OUTPUT, Arrays.asList(outDir));
        Iterable<? extends JavaFileObject> files = Arrays.asList((JavaFileObject) null);
        try {
            DocumentationTask t = tool.getTask(null, fm, null, null, null, files);
            error("getTask succeeded, no exception thrown");
        } catch (NullPointerException e) {
            System.err.println("exception caught as expected: " + e);
        }
    }
}
 

import javax.tools.StandardJavaFileManager; //导入依赖的package包/类
/**
 * Verify that an alternate doclet can be specified.
 *
 * There is no standard interface or superclass for a doclet;
 * the only requirement is that it provides static methods that
 * can be invoked via reflection. So, for now, the doclet is
 * specified as a class.
 * Because we cannot create and use a unique instance of the class,
 * we verify that the doclet has been called by having it record
 * (in a static field!) the comment from the last time it was invoked,
 * which is randomly generated each time the test is run.
 */
@Test
public void testDoclet() throws Exception {
    Random r = new Random();
    int key = r.nextInt();
    JavaFileObject srcFile = createSimpleJavaFileObject(
            "pkg/C",
            "package pkg; /** " + key + "*/ public class C { }");
    DocumentationTool tool = ToolProvider.getSystemDocumentationTool();
    try (StandardJavaFileManager fm = tool.getStandardFileManager(null, null, null)) {
        File outDir = getOutDir();
        fm.setLocation(DocumentationTool.Location.DOCUMENTATION_OUTPUT, Arrays.asList(outDir));
        Iterable<? extends JavaFileObject> files = Arrays.asList(srcFile);
        DocumentationTask t = tool.getTask(null, fm, null, TestDoclet.class, null, files);
        if (t.call()) {
            System.err.println("task succeeded");
            if (TestDoclet.lastCaller.equals(String.valueOf(key)))
                System.err.println("found expected key: " + key);
            else
                error("Expected key not found");
            checkFiles(outDir, Collections.<String>emptySet());
        } else {
            throw new Exception("task failed");
        }
    }
}
 

import javax.tools.StandardJavaFileManager; //导入依赖的package包/类
/**
 * Verify that expected output files are written via the file manager,
 * for a source file read from the file system with StandardJavaFileManager.
 */
@Test
public void testStandardFileObject() throws Exception {
    File testSrc = new File(System.getProperty("test.src"));
    File srcFile = new File(testSrc, "pkg/C.java");
    DocumentationTool tool = ToolProvider.getSystemDocumentationTool();
    try (StandardJavaFileManager fm = tool.getStandardFileManager(null, null, null)) {
        File outDir = getOutDir();
        fm.setLocation(DocumentationTool.Location.DOCUMENTATION_OUTPUT, Arrays.asList(outDir));
        Iterable<? extends JavaFileObject> files = fm.getJavaFileObjects(srcFile);
        DocumentationTask t = tool.getTask(null, fm, null, null, null, files);
        if (t.call()) {
            System.err.println("task succeeded");
            checkFiles(outDir, standardExpectFiles);
        } else {
            throw new Exception("task failed");
        }
    }
}
 

import javax.tools.StandardJavaFileManager; //导入依赖的package包/类
public void testJavac() throws Exception {
    final JavaCompiler jc = ToolProvider.getSystemJavaCompiler();
    final StandardJavaFileManager fm = jc.getStandardFileManager(
            null,
            Locale.ENGLISH,
            Charset.forName("UTF-8"));  //NOI18N
    fm.setLocation(
            StandardLocation.CLASS_PATH,
            Collections.singleton(FileUtil.archiveOrDirForURL(mvCp.entries().get(0).getURL())));
    Iterable<JavaFileObject> res = fm.list(
            StandardLocation.CLASS_PATH,
            "", //NOI18N
            EnumSet.of(JavaFileObject.Kind.CLASS),
            true);
    assertEquals(3, StreamSupport.stream(res.spliterator(), false).count());
}
 

import javax.tools.StandardJavaFileManager; //导入依赖的package包/类
public static void parse(Path moduleInfoPath, ModuleClassVisitor moduleClassVisitor) throws IOException {
  JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
  try(StandardJavaFileManager fileManager = compiler.getStandardFileManager(null, null, null)) {
    Iterable<? extends JavaFileObject> compilationUnits = fileManager.getJavaFileObjects(moduleInfoPath);
    CompilationTask task = compiler.getTask(null, fileManager, null, null, null, compilationUnits);
    JavacTask javacTask = (JavacTask)task;
    Iterable<? extends CompilationUnitTree> units= javacTask.parse();
    CompilationUnitTree unit = units.iterator().next();

    ModuleHandler moduleHandler = new ModuleHandler(moduleClassVisitor);
    TreeVisitor<?,?> visitor = (TreeVisitor<?,?>)Proxy.newProxyInstance(TreeVisitor.class.getClassLoader(), new Class<?>[]{ TreeVisitor.class},
        (proxy, method, args) -> {
          ModuleHandler.METHOD_MAP
          .getOrDefault(method.getName(), (handler, node, v) -> { 
            throw new AssertionError("invalid node " + node.getClass());
          })
          .visit(moduleHandler, (Tree)args[0], (TreeVisitor<?,?>)proxy);
          return null;
        });

    unit.accept(visitor, null);
  }
}
 

import javax.tools.StandardJavaFileManager; //导入依赖的package包/类
public static void main(String... args) throws Exception {

        //create default shared JavaCompiler - reused across multiple compilations
        JavaCompiler comp = ToolProvider.getSystemJavaCompiler();
        try (StandardJavaFileManager fm = comp.getStandardFileManager(null, null, null)) {

            for (VersionKind vk : VersionKind.values()) {
                for (EnclosingKind ek : EnclosingKind.values()) {
                    for (MethodKind mk : MethodKind.values()) {
                        for (ModifierKind modk1 : ModifierKind.values()) {
                            for (ModifierKind modk2 : ModifierKind.values()) {
                                new TestDefaultMethodsSyntax(vk, ek, mk, modk1, modk2).run(comp, fm);
                            }
                        }
                    }
                }
            }
            System.out.println("Total check executed: " + checkCount);
        }
    }
 

import javax.tools.StandardJavaFileManager; //导入依赖的package包/类
@Test
public void testSystemModules(Path base) throws IOException {
    try (StandardJavaFileManager fm = comp.getStandardFileManager(null, null, null)) {
        Location locn = StandardLocation.SYSTEM_MODULES;

        Location javaCompiler = fm.getLocationForModule(locn, "java.compiler");
        // cannot easily verify default setting: could be jrt: or exploded image

        Path override1 = Files.createDirectories(base.resolve("override1"));
        fm.setLocationForModule(locn, "java.compiler", List.of(override1));
        checkEqual("override setting 1",
                fm.getLocationAsPaths(javaCompiler), override1);

        Path override2 = Files.createDirectories(base.resolve("override2"));
        fm.setLocationFromPaths(javaCompiler, List.of(override2));
        checkEqual("override setting 2",
                fm.getLocationAsPaths(javaCompiler), override2);
    }
}
 

import javax.tools.StandardJavaFileManager; //导入依赖的package包/类
/**
 * Returns an empty processor iterator if no processors are on the
 * relevant path, otherwise if processors are present, logs an
 * error.  Called when a service loader is unavailable for some
 * reason, either because a service loader class cannot be found
 * or because a security policy prevents class loaders from being
 * created.
 *
 * @param key The resource key to use to log an error message
 * @param e   If non-null, pass this exception to Abort
 */
private Iterator<Processor> handleServiceLoaderUnavailability(String key, Exception e) {
    JavaFileManager fileManager = context.get(JavaFileManager.class);

    if (fileManager instanceof JavacFileManager) {
        StandardJavaFileManager standardFileManager = (JavacFileManager) fileManager;
        Iterable<? extends File> workingPath = fileManager.hasLocation(ANNOTATION_PROCESSOR_PATH)
            ? standardFileManager.getLocation(ANNOTATION_PROCESSOR_PATH)
            : standardFileManager.getLocation(CLASS_PATH);

        if (needClassLoader(options.get(PROCESSOR), workingPath) )
            handleException(key, e);

    } else {
        handleException(key, e);
    }

    java.util.List<Processor> pl = Collections.emptyList();
    return pl.iterator();
}
 

import javax.tools.StandardJavaFileManager; //导入依赖的package包/类
void checkContains(StandardJavaFileManager fm, Location l, FileObject fo, boolean expect) throws IOException {
    boolean found = fm.contains(l, fo);
    if (found) {
        if (expect) {
            out.println("file found, as expected: " + l + " " + fo.getName());
        } else {
            error("file not found: " + l + " " + fo.getName());
        }
    } else {
        if (expect) {
            error("file found unexpectedly: " + l + " " + fo.getName());
        } else {
            out.println("file not found, as expected: " + l + " " + fo.getName());
        }
    }
}
 

import javax.tools.StandardJavaFileManager; //导入依赖的package包/类
public static void main(String[] args) throws Exception {
    File src = new File("C.java");
    Writer w = new FileWriter(src);
    try {
        w.write("import static p.Generated.m;\nclass C { {m(); } }\n");
        w.flush();
    } finally {
        w.close();
    }
    JavaCompiler jc = ToolProvider.getSystemJavaCompiler();
    try (StandardJavaFileManager fm = jc.getStandardFileManager(null, null, null)) {
        JavaCompiler.CompilationTask task = jc.getTask(null, fm, null, null, null,
                                                       fm.getJavaFileObjects(src));
        task.setProcessors(Collections.singleton(new Proc()));
        if (!task.call()) {
            throw new Error("Test failed");
        }
    }
}
 

import javax.tools.StandardJavaFileManager; //导入依赖的package包/类
/**
 * Get the appropriate factory, based on the file manager given in the
 * configuration.
 */
static synchronized DocFileFactory getFactory(Configuration configuration) {
    DocFileFactory f = factories.get(configuration);
    if (f == null) {
        JavaFileManager fm = configuration.getFileManager();
        if (fm instanceof StandardJavaFileManager)
            f = new StandardDocFileFactory(configuration);
        else {
            try {
                Class<?> pathFileManagerClass =
                        Class.forName("com.sun.tools.javac.nio.PathFileManager");
                if (pathFileManagerClass.isAssignableFrom(fm.getClass()))
                    f = new PathDocFileFactory(configuration);
            } catch (Throwable t) {
                throw new IllegalStateException(t);
            }
        }
        factories.put(configuration, f);
    }
    return f;
}
 

import javax.tools.StandardJavaFileManager; //导入依赖的package包/类
@Test
public void testBasic(Path base) throws IOException {
    try (StandardJavaFileManager fm = comp.getStandardFileManager(null, null, null)) {
        Location[] locns = {
            StandardLocation.SOURCE_PATH,
            StandardLocation.CLASS_PATH,
            StandardLocation.PLATFORM_CLASS_PATH,
        };
        // set a value
        Path out = Files.createDirectories(base.resolve("out"));
        for (Location locn : locns) {
            checkException("unsupported for location",
                    IllegalArgumentException.class,
                    "location is not an output location or a module-oriented location: " + locn,
                    () -> fm.setLocationForModule(locn, "m", List.of(out)));
        }
    }
}
 

import javax.tools.StandardJavaFileManager; //导入依赖的package包/类
/**
 * Returns an empty processor iterator if no processors are on the
 * relevant path, otherwise if processors are present, logs an
 * error.  Called when a service loader is unavailable for some
 * reason, either because a service loader class cannot be found
 * or because a security policy prevents class loaders from being
 * created.
 *
 * @param key The resource key to use to log an error message
 * @param e   If non-null, pass this exception to Abort
 */
private Iterator<Processor> handleServiceLoaderUnavailability(String key, Exception e) {
    if (fileManager instanceof JavacFileManager) {
        StandardJavaFileManager standardFileManager = (JavacFileManager) fileManager;
        Iterable<? extends Path> workingPath = fileManager.hasLocation(ANNOTATION_PROCESSOR_PATH)
            ? standardFileManager.getLocationAsPaths(ANNOTATION_PROCESSOR_PATH)
            : standardFileManager.getLocationAsPaths(CLASS_PATH);

        if (needClassLoader(options.get(Option.PROCESSOR), workingPath) )
            handleException(key, e);

    } else {
        handleException(key, e);
    }

    java.util.List<Processor> pl = Collections.emptyList();
    return pl.iterator();
}
 

import javax.tools.StandardJavaFileManager; //导入依赖的package包/类
static void javac(Path dest, List<Path> sourceFiles) throws IOException {
    JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
    try (StandardJavaFileManager fileManager =
                 compiler.getStandardFileManager(null, null, null)) {
        List<File> files = sourceFiles.stream()
                                      .map(p -> p.toFile())
                                      .collect(Collectors.toList());
        Iterable<? extends JavaFileObject> compilationUnits =
                fileManager.getJavaFileObjectsFromFiles(files);
        fileManager.setLocation(StandardLocation.CLASS_OUTPUT,
                                Arrays.asList(dest.toFile()));
        fileManager.setLocation(StandardLocation.CLASS_PATH,
                                Arrays.asList(TEST_CLASSES.toFile()));
        JavaCompiler.CompilationTask task = compiler
                .getTask(null, fileManager, null, null, null, compilationUnits);
        boolean passed = task.call();
        if (!passed)
            throw new RuntimeException("Error compiling " + files);
    }
}